Partial Differential Equations Invariant under Conformal or Projective Transformations††The results in this paper were obtained during the summer of 1967, several months before Charles Loewner died.
1998 ◽
Vol 14
(4)
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pp. 883-903
2009 ◽
2013 ◽
Vol 1
(1)
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pp. 92-101